Anyone have experience adding a Canadian subsidiary? Does it require Canada localization and/or should I look for a Canada implementation focused vendor or is it a pretty straightforward setup?

pretty straight forward since Canada uses the same US version in NS, you may need to setup the tax nexuses

Ok cool thanks. Yeah looking through documentation it seemed pretty straightforward. Just wanted to make sure there weren't any additional bundles or einvoicing required.

FYI from the start 1999 Netledger (netsuite's old name) supported only 2 countries US and Canada